G-bijstdeb and pulvebizeb



Feb. 9 1926. 1,572,692

H. J. SHELTON GRINDER AND PULVERIZER Filed July 1'?,A 1922 Z 7) f3 7 g //,1// 1 ////7//T u w e I 6 3 i 'Z0 I u# i* i l 5 g g J1 13 r 5 x l l l In l l n l l Y\ ",h l *4.

h r\ r 4 z/Z =1 ze: l 3 l u* l f d e l 16:2? 1 l fig g Jil 14 x 13@ IL# E x 15 1 "lf I 7 i J5 INVENTOR Harry J She/fon Mlm Patented Feb. 9, l

UNITED STATES HARRY J'. SHELTON, 01E* ST.` LOUIS, MISSOUR.

GRINIDER AND PULVERIZER.

.To nl@ it/rom t may concern:

` Be itlrnown that I, Hanni* el. Sriiiri'ron, residing in the city of StiLouis, in the State of Missouri, liave'invented a new and useful Improvement y.in (irriiiders andljulverizers, of which the following is full, clear, and enact specification, reference being had to the accompanying drawings, vwhich form a par thereof.. y i

invention relates to grinders and pulveriz'eis, vand more particularly to grinders and pulverizers of a type in which the inaterial to be ground or pulverized is passed between grinding rolls and a grinding ring.

In the use of a grinder and pulverizer of this character it is very commonto feed too rapidly the material to be reduced, thereby overloading the machine `and it is also quite common for pieces of metal, rock, or other hard substances to get in with the material being ground orpulverized. In both cases great harm is often done to the machine when eitherthe overload of material o r the liarchforeign substance passes between the grinding' rolls andthe grinding ring. Sev- 'eral devices have been designed to lallow the grinding". 'rolls tov kick back from the grinding ring when encountering an overload or a hard substance in the material being ground, but it wasfouiid that suoli devices were not dependable and that some time a hard substance was wedged between the grinding roll and grinding ring .thereby bending the shaft upon which the grinding roll was mounted or otherwise seriously injuring the machine.

The objects of my inventionrare to provide ni'eans for mounting the grinding rolls in a grinder and pulverizer which will. eliminate breakage of the grinding roll or damageto n the machine under an overload of material to be ground or because a hard substance `is in said material; .to provide a means forl mounting the grinding rolls in a grinder and pulverizer whereby the rolls may kick back from the grinding ring'when encountering an overload or material or a hard, foreign substance is in the material being reduced;

and to provide a resilient means for mounting the grindingrolls in a 4grinder and pul verizer which will facilitate the adjustment .of said rolls in relation to the grinding ring.

My invention 'is fully shown in the accom# panying drawings wherein similar numerals rarefused ite designate similarparts. Fig. 1

snsd? lsf/.elias .0i a 'grinder and pulverthreaded on thelend of the shaft 9 holds i922. semi Nol 575,561.

.placed and lfroiii which the materialv is passed through a" discharge pipe,`- not shown, Iinto the inside of the grinding ring.

A side casting 2 is hinged to the main casting on the pintle 3 passing through the e);- teiisionsfd and 3D from the castings l and 2, respectively. The side casting 2 is, preferably, maintained in position on the casting lby means of the bolts 4 passing through the lugs 5, as shown inliig. 2. The grinding ring 6 is fastenedto the back plate ,7i by means of the bolts S and both the grinding vring 6 and the plate 7 are mountedon the drive shaft 9 so as to be rotated thereby. The drive shaft 9 is revolvably mounted-so kas to extend through the vertical rear wall of the main casting l and the large nut l0 the grinding ring in place thereon. The rgrinding rolls ll are, preferably, journaled on the shaft 1Q extending from the arm 13 and are adapted to bear against the inner or grinding surface lof the grinding ring G. The grinding rolls are, preferably, convex, so as to conform to the concave contour of the grinding ring, as shown in Fig.` 2.

- By placing the pairof grinding rolls ll so that thev Contact with the vrindine rino' .i le: b c;

6 at points 'thereon that are substantially diameti'ically opposite each other, as shown on the drawings, the pressure of the rolls on u the ring does not tend to twist the ring shaft 9 in its bearings and thereby undue friction ofthe shaft in the bearings is avoided. This positioning of the rolls with respect to the grinding'ring insures also that substantially all/jef the strain due to the pressure of the rolls 1l is taken up by the ring and not by the bearings of the shaft 9.'V

The resilient means for holding thegrindy ing rolls against the 'grinding ring is constructed as follows: The' wrist 14;, formed at and preferably made integral with one end of the arm 13, is niountedin the bearing 15. The clevis 16 is swingably attached to the end of the arm l opposite the end having the wrist 14- formed thereon. The shaft 1Q extends: from the. arm 131LA between the -elevis 1G and the wrist 114e: Theshank end 16L of the @levis 1G has a socket therein adapted to' .receive the end of theLunth-readed"end .ofthe bolt or rod 17. The rod or bolt 17 is threaded for the greater portion of its-length lfrom the head towards the endbutthe portion adjaeentits end is unthreaded'wnand reduced Qformed inaboss 241 integral with the side casting Quot the housing, with the pins 22 engagingin'notches'23 formed in the walls ofuthe'eree'ess 23g The spring 20A expanding between the washer 19, which isheld 'immoyable bythe shoulder 18, and the' faceofethe elevis 1G holds the arnrl outwardly, thereby maintaining the grinding roll 1 1' in properrelation with the grinding-ringe If'the machine is overloaded orl ahard substance is in the'materia-l beingfground orpulverized, the grinding roll is allowed to kiek back from the grindingring when' the strainof such overload or hard substance transmitted through the arnr13 is suflieient, to compress the spring20. The eornp/ressionof the spring 20 and, in-turn, thezrelation between the *Y grinding roll 11 and thegrinding ring f6 i' .the bloei; 21.

may be regulated by turning the Vrodl 17in In` the grinding roll v is to bear harder againstv the grinding ringthe screw shaft isftfurned'so tliatAt-h'e washerjl) @moves towards the devis-16 thereby comi. ring 6 pressing the spring; The recessv '231 is vslightly larger than x the*H block) 21,fso that the screw shaft 1f? may` pivot` slightlyfon thepinsQQ as auf axis to' allow grthe change in angle between'V the sei-ew shaft andthe armH13w-hen saidshait is tur-ned in ladjustingthe rolls 11 inre'lation tothegrinding ring o.

. the grinding ring 6 ,are carriedfby. the side casting e 2, all as deseribed`-aboye,y g the bolts 4f may be withdrawn `from the lugs 5 andthe side casting may beuswung., around onthe pint'le g 3v out ofoperative 'l positionj onV said main eastingy to carry th v rgrinding rolls 1.1out2 of" engagement" with Thil .CQ cess' to ,the lhousi jried by saidside casting for1 en 'the' grinding' stoodthat the shape of many of the parts and.particularly the method for pivot-ally mounting the arm 13, the means for adJust- `ino' the shaft 17 and the form of slrino' s l e used may be varied within a Wide range without deviating from the spirit of my invention.

lVhat I claim as new. and desire to, secure by Letters Patent, is.:` 1. ln a grinder and 4pulverizer havingy a housing,eomprisingxa maineeasting with a grinding ring rotatably mounted therein and a siar eoastinghingedto. said main easting a pair oi grinding rolls rotatably mounted to Contact' with the `innersurfae 0f. Said t seeding. fins at Substantially diametrieally opposite u points thereof; each of said grindind' rolls having assoeiated tlierev'ivith"eaI uibon` which Vsaidl roll is mounted, an a-rnrpivoftallymounted on said lside e casting and `carrying said' shaft, resilitherewitlra shaft upon which saidgroll is:

mounted.,v an arm pivotally.,mounted'on said sideleasting: and carrying said shaft; resilient means pivotally mounted onand Carfaging said arm to V'cause its associated Agrinding'roll' to be held normally in grinding'relationV with grinding f 3. In a grinderand pulverizer having a housing comprising va main casting with' a grinding ring rotatably mounted 4therein anda side casting hinged to Ysaidpmain casting,A aA pair of-` grinding rolls 4rotatably mounted tocont'act With-the inner surfaee of said grinding ring atsubstantiallydiametricallyopposite poi'nt's thereof;l eaehfofsai'd grinding vrolls' having assoeiated"therewith a shaft' upon `which sai'd'rollis;1nounted, an arin'pivotally mounted at' oneend onv said side casting and( earrylng said shaft7V ad- Vju'stable resilient means mounted@ on and carried byfsaid -side casting fer-f engaging the.4 yfree endfotsaid arm to 'Cause itsgassoeiated' grinding rollte-bei held" normally in din'gring.. Y ifi-zer 'havingfa.

Cast,

grinding ring rotatably mounted therein and a side casting` hinged to said main casting, a pair of grinding rolls rotatably mounted to Contact With the inner surface of said grinding ring at substantially diametrioally opposite points thereof, each of said grinf ing rolls having` vassociated therewith a shaft upon which said roll is mounted, an arm pivotally mounted at one end on said 10 side casting and having said shaft mounted thereon intermediate the. ends thereof, adjustable resilient means pivotally mounted on and carried by said side casting for enraging the -free end of said arm to cause its associated grinding roll to be held normally in grinding relation with Said grinding ring.

In Witness whereof I have signed my name to this specification.

HARRY J. SHELTON. 

